Lifting-jack



No. 6|3,3|7. Patented.Nov. I, 1898. 0. A. RUHRER.

LIFTING JACK.

(Application led June 6, 1898.)

(No Model.)

SSQS

UNITED TATES ATENT FFICE.

OSCAR A. ROI-IRER, OF WAVERLY, ILLINOIS.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent No. 613,317, dated November 1, 1898.

Application filed Tulle 6, 1898. Serial No. 682,717. (No model.)

To all whom, t may concern:

Be it known that I, OSCAR A. ROHRER, a citizen of the United States, residing at Vaverly, in the county of Morgan and State of Illinois, have invented a new and useful Lifting-Jack, of which the following is a specification.

This invention relates to lifting-jacks of that class comprising a standard, a pair of sleeves mounted to slide upon the standard, and an operating-lever having suitable connections between the sleeves, whereby a stepby-step movement thereof is obtained to lift the desired weight.

The object of the present invention is to provide a device of this class which will automatically lock the upper sleeve, carrying the weight to be raised, while the lower sleeve is being elevated to obtain a new leveragepoint and to disengage both sleeves in order that they may be quickly adjusted upon the standard, at the same time preserving a simple and durable construction. This and other objects and advantages of adevice constructed in accordance with my invention will be hereinafter more fully described, shown in the drawings, and particularly pointed out in the claims.

In the drawings, Figure 1 is an elevation of my device in position to raise the weight. Fig. 2 is a similar view after the lever has been depressed. Fig. 3 is a detail perspective view of the sliding sleeves.

Corresponding parts in the several figures are denoted by like characters of reference.

Referring to the drawings, 1 designates the base of the lifting-jack, which supports the upright standard 2, having a ratchet edge or rack 8 and provided with a handle 4 at the top of the standard, whereby the device may be carried from place to place. Mounted to slide easily upon the standard are two sleeves 5 and 6, the upper one, 5, carrying the liftingfoot 7 at one side of the standard and having the operating-lever 8, pivoted to the opposite side thereof, forming the lifting-sleeve, while the lower one forms the fulcrum-sleeve. This lever 8 has an approximately triangular head 9, forming, in eifect, a bell-crank lever, and is connected to the lower sleeve 6 by means of a rod 10, pivotally connected at its ends, forming a toggle connection between the two sleeves. Each of the sliding sleeves comprises a suitable casing, embracing the standard and eX- tending a convenient distance beyond the rack edge thereof to aord room for a pawl 11, normally engaging the rack by use of a suitable spring 12. The pawl 11 in the sleeve 5 is provided with a thumb-lever 13 and a pivoted latch 14, whereby the pawl may be held out of engagement with the rack, as shown in Fig. 2.

The pawl 11 in the lower sleeve 6 has a thumb-lever 14 and a rod 15 connected therewith, extending upward and having its upper end working in a guide-socket 16, provided upon the face of the upper sleeve. The object of this arrangement is to release the pawl from engagement with the rack by raising the lever 8 to its greatest height, which will depress the lifting-sleeve enough to bring the top of the socket 16 into engagement with the top of rod 15 and press the same slightly downward, which will operate the thumb-lever 14C to disengage the pawl 11, which is plainly shown in dotted lines in Fig. 1. By thus operating the lever 8 and also turning the pivoted latch 14 against the thumb-lever 13 the pawl 11 is disengaged from the rack and both sleeves may be quickly adjusted to any desired position.

In the operation of my device the lever 8 being in the position shown in Fig. 1 is der pressed until the foot 7 is sufficiently elea vated, as in Fig. 2, when the device is locked both by the pawl 11 and by reason of the pivot-points A, B, and. O being alined one alcove the other. The upper lifting-sleeve is normally locked against a downward movement by the pawl 11, so that it does not mat ter what position the handle is in the device is always firmly locked.

It will be readily understood how the ful Crum-sleeve is raised by the lever to assume a higher support for the rod connecting the two sleeves, and thus the sleeves are alter nately operated to raise the weight step by step to the desired point.

A lifting-jack constructed in accordance with my invention presents an exceedingly durable and eective device which is capa-A IOO tion, and minor details, and I therefore do not wish to be understood as limiting myself to the precise construction and arrangement as herein described, and shown in the drawlngs.

Having thus described the invention, what is claimed, and desired to bc secured by Letters Patent, is-

1. In a device of the class described, the combination with a standard having a rack provided upon one edge, of a lifting-sleeve slidably mounted upon the standard having a pawl engaging the rack and provided with a thumb-lever, apivoted latch adapted to engage the thumb-lever, a fulcrum-sleeve slidably mounted upon the standard having a pawl engaging the rack, a lever having an operative connection between the two sleeves, and means for automatically disengaging the pawl upon the fulcrum-sleeve, substantially as shown and described.

2. In a device of the class described, the combination with a standard having a rack on one edge, of a lifting-sleeve and a fulcrumsleeve, each of the sleeves having a pawl engaging the rack and provided with a thumblever, the lifting-Sleeve having a pivoted latch adapted to engage the thumb-lever thereof, and the fulcrum-sleeve having a rod connected at one end with the thumb-lever thereon, a hollow guide provided upon the face of the lifting-sleeve and receiving the other end of the said rod, and an operating-lever having a toggle connection between the two sleeves, substantially as shown and described.

3. In a device of the class described, the combination with a standard, of a liftingsleeve and a fulcrum-sleeve, and means carried by each sleeve for automatically engaging the standard, the fulcrum-sleeve having a rod connected with the engaging means thereof, and the lifting-sleeve having a hollowr guide receiving the said rod, whereby the fulcrum-sleeve may be released from the standard by a downward movement of the lifting-sleeve, and a lever having an operative connection between the two sleeves, whereby a step-by-step movement of the latter may be obtained, substantially as shown and described.

4. In a device of the class described, the combination with a standard, of a liftingsleeve, a fulcrum-sleeve, means carried by each sleeve for automatically engaging the standard, releasing devices connected to the engaging means of the fnlcrum-sleeve and adapted to make connection with the liftingsleeve, whereby a downward movement of the latter sleeve will automatically release the fulcrum-sleeve from the standard, and a lever having an operative connection between the two sleeves and adapted to impart the downward movement to the lifting-sleeve, substantially as described.

5. In a device of the class described, the combination with a standard, of a liftingsleeve and a fulcrum-sleeve, each sleeve having means automatically engaging the standard, a rod connected at one end to the engaging means of the fulcrum-sleeve, a guide having a stop-shoulder provided upon the lifting-sleeve and receiving the other end of the said rod, whereby the fulcrum-sleeve may be released from the standard by a downward movement of the lifting-sleeve, and an operating-lever having a toggle connection bctween the two sleeves, whereby a step-bystep movement of the latter may be obtained and the downward movement imparted to the lifting-sleeve, substantially as shown and described.

In testimony that I claim the foregoing as my own I have hereto aiiixed my signature in the presence of two witnesses.

OSCAR A. ROI'IRER.

Vitnesses:

HARDIN L. TURNER, JOE B. LOMBARD. 

